Titanium dioxide precoated dynamic membrane photocatalytic water treatment device

A technology for membrane photocatalytic water and titanium dioxide, which is applied in the fields of oxidized water/sewage treatment, light water/sewage treatment, energy and waste water treatment, etc. effects, etc.

Inactive Publication Date: 2010-07-28

JIUJIANG UNIVERSITY

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AI-Extracted Technical Summary

Problems solved by technology

But there are also some shortcomings: in the continuous operation process, the organic pollutants entering the reactor have a certain residence time distribution, and some small molecular organics pass through the separation membrane before being completely oxidized and flow out together with the permeate , which affects the final treatment effect; in addition, there are some small and medium molecular organic pollutants that have not been fully oxidized and entered the membrane pores, ca...

Abstract

The invention discloses a titanium dioxide precoated dynamic membrane photocatalytic water treatment device which mainly comprises a precoated dynamic membrane photocatalytic reactor 13 and a prereactor 16. The precoated dynamic membrane photocatalytic reactor 13 is internally provided with an ultraviolet lamp 9-1, a ceramic membrane tube 8 and a gas-distributing plate 7-1 and connected with a suction pump 1 and an air compressor 5 at the bottom, the prereactor 16 is internally provided with an ultraviolet lamp 9-2 and a gas-liquid distributing plate 7-2, and the precoated dynamic membrane photocatalytic reactor 13 and the prereactor 16 are connected by a water inlet pipe 14 and a water outlet pipe 12 to form a loop. By adding titanium dioxide precoated dynamic membrane to a floating photocatalytic reactor for integration, the invention not only has the advantages of great solid-liquid contact area, high reaction efficiency, simple precoated dynamic membrane preparation, full catalyst recycle, and the like, but also can effectively lessen the pollution of the ceramic membrane tube 8, prolong the operation period of the device, simplify the cleaning regeneration process of the ceramic membrane tube 8 and decrease the operation cost.

Application Domain

Water/sewage treatment by irradiationEnergy based wastewater treatment +1

Technology Topic

Titanium dioxideEngineering +5

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Examples

Experimental program(3)

Example Embodiment

[0020] Example one:

[0021] Use the above device to treat methyl orange wastewater, the wastewater concentration is 0.8g/l, pH value is 4.2, 20-100W high-pressure mercury lamp is used, and the effective reaction volume of the two reactors in the device is 5-8 liters, and 6 is added to it. Gram anatase TiO 2 , TiO 2 The average particle size is 0.2 μm. The ceramic membrane material used is Al 2 O 3 , 3 ceramic membrane tubes, the average pore diameter is 0.1μm, the length is 30cm, the outer diameter is 13mm, the inner diameter is 9mm, the reaction temperature is 25-30℃, the suction negative pressure is stable in the range of 0.06-0.08MPa, the air The gas velocity (corrected) is stable at 15-30L/min, the gas backwash pressure is 0.4MPa, and the gas backwash time is 8s. Under the above conditions, the pre-coated dynamic membrane is prepared first, then the methyl orange wastewater is treated, and finally the membrane is cleaned and regenerated to complete a running cycle. When treating methyl orange wastewater, monitor the methyl orange and TiO in the water every 10 minutes 2 The concentration and membrane flux. The monitoring results show that the average removal rate of methyl orange is over 98%, and TiO 2 The catalyst retention rate can reach over 99.9%, and the membrane flux is maintained at 200L.m -2 About .h, the running cycle can reach 15-30 hours.

Example Embodiment

[0022] Embodiment two:

[0023] Use the above device to treat methyl orange wastewater, the wastewater concentration is 0.9g/l, pH value is 4.3, 20-100W high pressure mercury lamp is used, and the effective reaction volume of the two reactors in the device is 5-8 liters, and 7 is added to it. Gram anatase TiO 2 , TiO 2 The average particle size is 0.2 μm. The ceramic membrane material used is Al 2 O 3 , 4 ceramic membrane tubes, the average pore diameter is 0.1μm, the length is 30cm, the outer diameter is 13mm, the inner diameter is 9mm, the reaction temperature is 25-30℃, the suction negative pressure is stable in the range of 0.06-0.08MPa, and the inlet The gas velocity (corrected) is stable at 15-30L/min, the gas backwash pressure is 0.4MPa, and the gas backwash time is 8s. Under the above conditions, the pre-coated dynamic membrane is first prepared, then the methyl orange wastewater is treated, and finally the membrane is cleaned and regenerated to complete a running cycle. When treating methyl orange wastewater, monitor the methyl orange and TiO in the water every 10 minutes 2 The concentration and membrane flux. The monitoring results show that the average removal rate of methyl orange is over 98%, and TiO 2 The catalyst retention rate can reach over 99.9%, and the membrane flux is maintained at 200L.m -2 About .h, the running cycle can reach 15-30 hours.

Example Embodiment

[0024] Embodiment three:

[0025] Use the above device to treat methyl orange wastewater, the wastewater concentration is 0.7g/l, the pH value is 4.1, 20-100W high-pressure mercury lamps are used, and the effective reaction volume of the two reactors in the device is 5-8 liters, and 5 is added to it. Gram anatase TiO 2 , TiO 2 The average particle size is 0.2 μm. The ceramic membrane material used is Al 2 O 3 , 2 ceramic membrane tubes, the average pore diameter is 0.1μm, the length is 30cm, the outer diameter is 13mm, the inner diameter is 9mm, the reaction temperature is 25-30℃, the suction negative pressure is stable in the range of 0.06-0.08MPa, and the inlet The gas velocity (corrected) is stable at 15-30L/min, the gas backwash pressure is 0.4MPa, and the gas backwash time is 8s. Under the above conditions, the pre-coated dynamic membrane is prepared first, then the methyl orange wastewater is treated, and finally the membrane is cleaned and regenerated to complete a running cycle. When treating methyl orange wastewater, monitor the methyl orange and TiO in the water every 10 minutes 2 The concentration and membrane flux. The monitoring results show that the average removal rate of methyl orange is over 98%, and TiO 2 The catalyst retention rate can reach over 99.9%, and the membrane flux is maintained at 200L.m -2 About .h, the running cycle can reach 15-30 hours.

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